A case of facial hypertrichosis in a museum specimen of a Bornean gibb
bon (Hylobates muelleri) is described. Apparently, hypertrichosis has
not previously been reported to occur in nonhuman primates. Similar pa
thological conditions are known to occur in humans, but it is unknown
whether any of the numerous forms of human hypertrichosis is equivalen
t to this case in gibbons.